Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa80943be3aa0df…

MALICIOUS

PDF

43.7 KB Created: 2020-07-30 19:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f272806f15547fbb0d5dfa425e8989fe SHA-1: 5a334fd2f092d21a952c5520981afa287783d696 SHA-256: 4aa80943be3aa0dfadd45efe13b2c2df48b8395fd45ecf3504f12c8883b3d8df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file contains a large number of embedded links, forming a link farm, with the primary purpose of redirecting users to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of the initial URLs, 'https://ttraff.cc/pify?keyword=renaissance+period+music+pdf', leads to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=renaissance+period+music+pdf
    • http://files.brunstaneproductions.co.uk/uploads/1/3/1/4/131407469/3520429.pdf
    • http://files.petersonclass.com/uploads/1/3/1/3/131398334/8274303.pdf
    • http://files.juniorbisonhockeyclub.com/uploads/1/3/2/7/132740399/bolokikutenuma.pdf
    • http://files.mcearlychildhoodprogram.com/uploads/1/3/1/8/131871633/016078a8478c894.pdf
    • http://files.mcearlychildhoodprogram.com/uploads/1/3/1/8/131871633/016078a8478c
    • https://cdn.shopify.com/s/files/1/0433/8361/9738/files/ramuwinawijepuki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3590/files/69453551117.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/60488076230.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/8470525256.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/16685444298.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/41706156432.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/5808302836.pdf
    • https://cdn.shopify.com/s/files/1/0435/3101/0199/files/77673293287.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f4b.bin
507276194312c0f698d91e5c8511086c82b888d8d7896180187486455e4f94d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4B 5080 bytes
font_01_sfnt_off0000806c.bin
eabdb20535958ced77dea598447acf6b0cb71d660cce280d72e5c122a66cc211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806C 9784 bytes

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